It is wonderful that you have a good attitude; unfortunately, there’s nothing that you can do about her attitude.
Having a parent who resents you is hard as all get out, and I really congratulate you on how you have lived your life. And I bet you love your kids and grandkids...and they love you!
Good call. ;)
Also very tight with my brother and half sister(Not from my mother, but from the woman my dad remarried, who left her with dad when they divorced). We are "The family" now, even if our parents don't want to be.
I got over it a long time ago.